解:①15.28+
-(
),
=15.28+
-
-4.28,
=15.28-4.28+(
-
),
=11-
,
=10
;
②(
-
)÷(1÷25%-
),
=
÷(1÷
-
),
=
÷(4-
),
=
÷
,
=
×
,
=
;
③
,
=1
-[(3.62×
+6.38×
)],
=1
-[(3.62+6.38)×
],
=1
-[10×
],
=1
-1
,
=
;
④(1-
)×
÷
,
=(1-
)×
×
,
=
×
×
,
=
×
×
,
=
×(3×
+
),
=
×(
+
),
=
×
,
=
.
分析:①運(yùn)用減法的性質(zhì)以及加法交換律與結(jié)合律簡(jiǎn)算;
②把百分?jǐn)?shù)化為分?jǐn)?shù),兩個(gè)括號(hào)同時(shí)計(jì)算,最后算除法;
③先算小括號(hào)內(nèi)的除法,再算小括號(hào)內(nèi)的加法,然后算乘法,再算中括號(hào)內(nèi)的減法,最后算減法;
④把除法改為乘法,先算小括號(hào)內(nèi)的,原式變?yōu)?img class='latex' src='http://thumb.1010pic.com/pic5/latex/517942.png' />×
×
,然后把93拆為31×3,運(yùn)用乘法分配律簡(jiǎn)算.
點(diǎn)評(píng):此題考查了分?jǐn)?shù)的四則混合運(yùn)算,注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.